增加备案号

static/public/css/theme.css

@@ -50,7 +50,8 @@
 body {
     min-height: 100vh;
     display: flex;
-    justify-content: center;
+    flex-direction: column;
+    align-items: center;
     background: var(--bg);
     color: var(--fg);
     font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', Roboto, Arial, sans-serif;
@@ -245,6 +246,21 @@ blockquote {
     color: var(--fg-secondary);
 }
 
+/* ===== Footer ===== */
+.footer {
+    margin-top: auto;
+    padding-top: 1.5rem;
+    text-align: center;
+    font-size: 0.75rem;
+    color: var(--muted);
+}
+.footer a {
+    color: var(--muted);
+    text-decoration: none;
+    transition: color 0.15s;
+}
+.footer a:hover { color: var(--accent); }
+
 /* ===== Responsive ===== */
 @media (max-width: 480px) {
     body { padding: 1rem 0.8rem; }